# -----------------------------------------------------------------------------
# Copyright (c) 2023, 2024, Oracle and/or its affiliates.
#
# This software is dual-licensed to you under the Universal Permissive License
# (UPL) 1.0 as shown at https://oss.oracle.com/licenses/upl and Apache License
# 2.0 as shown at http://www.apache.org/licenses/LICENSE-2.0. You may choose
# either license.
#
# If you elect to accept the software under the Apache License, Version 2.0,
# the following applies:
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#    https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# -----------------------------------------------------------------------------

# -----------------------------------------------------------------------------
# subclassing_async.py
#
# An asynchronous version of subclassing.py
#
# Demonstrates how to subclass connections and cursors in order to add
# additional functionality (like logging) or create specialized interfaces for
# particular applications.
# -----------------------------------------------------------------------------

import asyncio

import oracledb
import sample_env


# sample subclassed Connection which overrides the constructor (so no
# parameters are required) and the cursor() method (so that the subclassed
# cursor is returned instead of the default cursor implementation)
class Connection(oracledb.AsyncConnection):
    def cursor(self):
        return Cursor(self)


# sample subclassed cursor which overrides the execute() and fetchone()
# methods in order to perform some simple logging
class Cursor(oracledb.AsyncCursor):
    async def execute(self, statement, args):
        print("EXECUTE", statement)
        print("ARGS:")
        for arg_index, arg in enumerate(args):
            print("   ", arg_index + 1, "=>", repr(arg))
        return await super().execute(statement, args)

    async def fetchone(self):
        print("FETCHONE")
        return await super().fetchone()


async def main():
    # create instances of the subclassed Connection and cursor
    connection = await oracledb.connect_async(
        user=sample_env.get_main_user(),
        password=sample_env.get_main_password(),
        dsn=sample_env.get_connect_string(),
        params=sample_env.get_connect_params(),
        conn_class=Connection,
    )

    with connection.cursor() as cursor:
        # demonstrate that the subclassed connection and cursor are being used
        await cursor.execute(
            "select count(*) from ChildTable where ParentId = :1", (30,)
        )
        (count,) = await cursor.fetchone()
        print("COUNT:", int(count))


asyncio.run(main())
